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e(e,t){this.mode=void 0,this.gullet=void 0,this.settings=void 0,this.leftrightDepth=void 0,this.nextToken=void 0,this.mode="math",this.gullet=new Cr(e,t,this.mode),this.settings=t,this.leftrightDepth=0}var t=e.prototype;return t.expect=function(e,t){if(void 0===t&&(t=!0),this.fetch().text!==e)throw new a("Expected '"+e+"', got '"+this.fetch().text+"'",this.fetch());t&&this.consume()},t.consume=function(){this.nextToken=null},t.fetch=function(){return null==this.nextToken&&(this.nextToken=this.gullet.expandNextToken()),this.nextToken},t.switchMode=function(e){this.mode=e,this.gullet.switchMode(e)},t.parse=function(){this.gullet.beginGroup(),this.settings.colorIsTextColor&&this.gullet.macros.set("\\color","\\textcolor");var e=this.parseExpression(!1);return this.expect("EOF"),this.gullet.endGroup(),e},t.parseExpression=function(t,n){for(var r=[];;){"math"===this.mode&&this.consumeSpaces();var o=this.fetch();if(-1!==e.endOfExpression.indexOf(o.text))break;if(n&&o.text===n)break;if(t&&dr[o.text]&&dr[o.text].infix)break;var i=this.parseAtom(n);if(!i)break;r.push(i)}return"text"===this.mode&&this.formLigatures(r),this.handleInfixNodes(r)},t.handleInfixNodes=function(e){for(var t,n=-1,r=0;r<e.length;r++){var o=Je(e[r],"infix");if(o){if(-1!==n)throw new a("only one infix operator per group",o.token);n=r,t=o.replaceWith}}if(-1!==n&&t){var i,s,l=e.slice(0,n),u=e.slice(n+1);return i=1===l.length&&"ordgroup"===l[0].type?l[0]:{type:"ordgroup",mode:this.mode,body:l},s=1===u.length&&"ordgroup"===u[0].type?u[0]:{type:"ordgroup",mode:this.mode,body:u},["\\\\abovefrac"===t?this.callFunction(t,[i,e[n],s],[]):this.callFunction(t,[i,s],[])]}return e},t.handleSupSubscript=function(t){var n=this.fetch(),r=n.text;this.consume();var o=this.parseGroup(t,!1,e.SUPSUB_GREEDINESS,void 0,void 0,!0);if(!o)throw new a("Expected group after '"+r+"'",n);return o},t.formatUnsupportedCmd=function(e){for(var t=[],n=0;n<e.length;n++)t.push({type:"textord",mode:"text",text:e[n]});var r={type:"text",mode:this.mode,body:t};return{type:"color",mode:this.mode,color:this.settings.errorColor,body:[r]}},t.parseAtom=function(e){var t,n,r=this.parseGroup("atom",!1,null,e);if("text"===this.mode)return r;for(;;){this.consumeSpaces();var o=this.fetch();if("\\limits"===o.text||"\\nolimits"===o.text){var i=Je(r,"op");if(i){var s="\\limits"===o.text;i.limits=s,i.alwaysHandleSupSub=!0}else{if(!(i=Je(r,"operatorname"))||!i.alwaysHandleSupSub)throw new a("Limit controls must follow a math operator",o);var l="\\limits"===o.text;i.limits=l}this.consume()}else if("^"===o.text){if(t)throw new a("Double superscript",o);t=this.handleSupSubscript("superscript")}else if("_"===o.text){if(n)throw new a("Double subscript",o);n=this.handleSupSubscript("subscript")}else{if("'"!==o.text)break;if(t)throw new a("Double superscript",o);var u={type:"textord",mode:this.mode,text:"\\prime"},c=[u];for(this.consume();"'"===this.fetch().text;)c.push(u),this.consume();"^"===this.fetch().text&&c.push(this.handleSupSubscript("superscript")),t={type:"ordgroup",mode:this.mode,body:c}}}return t||n?{type:"supsub",mode:this.mode,base:r,sup:t,sub:n}:r},t.parseFunction=function(e,t,n){var r=this.fetch(),o=r.text,i=dr[o];if(!i)return null;if(this.consume(),null!=n&&i.greediness<=n)throw new a("Got function '"+o+"' with no arguments"+(t?" as "+t:""),r);if("text"===this.mode&&!i.allowedInText)throw new a("Can't use function '"+o+"' in text mode",r);if("math"===this.mode&&!1===i.allowedInMath)throw new a("Can't use function '"+o+"' in math mode",r);var s=this.parseArguments(o,i),l=s.args,u=s.optArgs;return this.callFunction(o,l,u,r,e)},t.callFunction=function(e,t,n,r,o){var i={funcName:e,parser:this,token:r,breakOnTokenText:o},s=dr[e];if(s&&s.handler)return s.handler(i,t,n);throw new a("No function handler for "+e)},t.parseArguments=function(e,t){var n=t.numArgs+t.numOptionalArgs;if(0===n)return{args:[],optArgs:[]};for(var r=t.greediness,o=[],i=[],s=0;s<n;s++){var l=t.argTypes&&t.argTypes[s],u=s<t.numOptionalArgs,c=0<s&&!u||0===s&&!u&&"math"===this.mode,f=this.parseGroupOfType("argument to '"+e+"'",l,u,r,c);if(!f){if(u){i.push(null);continue}throw new a("Expected group after '"+e+"'",this.fetch())}(u?i:o).push(f)}return{args:o,optArgs:i}},t.parseGroupOfType=function(e,t,n,r,o){switch(t){case"color":return o&&this.consumeSpaces(),this.parseColorGroup(n);case"size":return o&&this.consumeSpaces(),this.parseSizeGroup(n);case"url":return this.parseUrlGroup(n,o);case"math":case"text":return this.parseGroup(e,n,r,void 0,t,o);case"hbox":var i=this.parseGroup(e,n,r,void 0,"text",o);return i?{type:"styling",mode:i.mode,body:[i],style:"text"}:i;case"raw":if(o&&this.consumeSpaces(),n&&"{"===this.fetch().text)return null;var 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e=n.state.exercise_questions,t=-1,r=0;r<e.length;r++)if(1==e[r].isNew){t=r;break}e[t].question_id?n.setState((function(e){return{exercise_questions:O()(e.exercise_questions,Object(i.a)({},t,{isNew:{$set:!1}}))}})):n.setState((function(e){return{exercise_questions:O()(e.exercise_questions,{$splice:[[t,1]]})}}))},n.addQuestion=function(e,t){n.isEdit?n._checkIsEditing()||(t==g.d?n.addShixun(e):n.addEditingQuestion(t,e)):n.props.showNotification("\u8bf7\u5148\u8f93\u5165\u8bd5\u5377\u6807\u9898\uff0c\u5e76\u4fdd\u5b58\u8bd5\u5377")},n.chooseShixun=function(e){n.addEditingQuestion(g.d,n.question_id_to_insert_after,{shixun_id:e[0]})},n.chooseShixunSuccess=function(){n.refs.shixunChooseModal.setVisible(!1)},n.addShixun=function(e){n.isEdit?n._checkIsEditing()||(n.refs.shixunChooseModal.setVisible(!0),n.question_id_to_insert_after=e):n.props.showNotification("\u8bf7\u5148\u8f93\u5165\u8bd5\u5377\u6807\u9898\uff0c\u5e76\u4fdd\u5b58\u8bd5\u5377")},n.editQestion=function(e){n._checkIsEditing()||(n.editingId="#question_".concat(e),n.setState((function(t){return{exercise_questions:O()(t.exercise_questions,Object(i.a)({},e,{isNew:{$set:!0}}))}})))},n.onSort=function(e,t,r){if(!n._checkIsEditing()){var 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